CRS
A CRS (Coordinate Reference System) defines how geographic locations are expressed as coordinates: which datum, projection, and units. Examples: WGS84 (global GPS), RD New (Dutch topography and registries).
When combining layers, CRS must match or be transformed. Metadata in catalogs and services (WMS GetCapabilities) states the CRS; errors cause shifted maps.
CRS is not a coordinate value or bbox. It is the reference frame; coordinates are measurements within that frame. In GML and GeoJSON the CRS must be explicit or implicit.
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